Malicious PDF — malware analysis report

Static analysis result for SHA-256 29b59d1bf631d155…

MALICIOUS

PDF

95.5 KB Created: 2021-07-02 01:02:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a361da45e16f3083f4cf634f20336b58 SHA-1: c407b6e825f8b65ed0f199230b319bcdd4b11b1a SHA-256: 29b59d1bf631d15535bd5881a1933cd5b59d5b99e54ca1e12708a3c1b52a6f77
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malicious content delivery mechanism. It contains a link farm pointing to multiple disposable domains and a compromised WordPress upload directory, suggesting an attempt to redirect users to potentially harmful content or exploit SEO vulnerabilities. No scripts were extracted, but the structure and embedded URLs strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc5af56b97---92901849820.pdf In PDF document text
    • http://www.annaleehuber.com/content_files/file/21636391275.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/nujagofovegituzumur.pdfIn PDF document text
    • http://adveotec.com/img/file/ritigun.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/22812919007.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/loqbhllrlpfjqdrp2f220v5uch/maxoselel.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aab33dd8e6f---dufiridoxitomexadame.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/kufatu.pdfIn PDF document text
    • https://searchlink.org/userfiles//file/72553957587.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c1bea2137a5---dufaxirojarativoz.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16081804b0db4f---88541593030.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/zukasuwobipenukekuk.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa67446b838---narinadabutipinorelon.pdfIn PDF document text
    • http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/75730063086.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/xesofiwipegovowovof.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/c3tgg8r3k3so9dp2qjn1guatvn/guzitelirebixusowakib.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f17563205f---dadosex.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaab9f70d3e---32332121229.pdfIn PDF document text
    • http://rld-carbon.ru/file/58098617594.pdfIn PDF document text
    • http://yejida.com/userfiles/file/53070599582.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=fair+haired+child+meaningPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00012b71.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12B71 18328 bytes
SHA-256: d9f5e66163d907df9b2c2f031b8906ab183602eda4757f3e8ef428a9cf922d60
font_00_sfnt_off0000da5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5E 23608 bytes
SHA-256: 36879ccf3db153cdd46a76c8f4911a5bf7ca3b70e7765bcb3720309d39a2ff29
font_01_sfnt_off00011360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11360 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14913 10408 bytes
SHA-256: 973565e4b74401fb4a2493de5b5509340161f32b8835067b14818bef9a065380
font_04_sfnt_off00016013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16013 3696 bytes
SHA-256: 1a7f64320a4eead6da9cc7d284f5b11c13ae3ce9c143b8d3b561089a7b22dfea

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